CN108425725B - Water-cooled air auxiliary type automatic control urea solution injection system - Google Patents
Water-cooled air auxiliary type automatic control urea solution injection system Download PDFInfo
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- CN108425725B CN108425725B CN201810250122.4A CN201810250122A CN108425725B CN 108425725 B CN108425725 B CN 108425725B CN 201810250122 A CN201810250122 A CN 201810250122A CN 108425725 B CN108425725 B CN 108425725B
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- 239000004202 carbamide Substances 0.000 title claims abstract description 99
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 238000002347 injection Methods 0.000 title claims abstract description 64
- 239000007924 injection Substances 0.000 title claims abstract description 64
- 239000000243 solution Substances 0.000 title claims abstract description 50
- 239000007788 liquid Substances 0.000 claims abstract description 58
- 238000001816 cooling Methods 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 6
- 230000003111 delayed effect Effects 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 abstract description 5
- 238000005507 spraying Methods 0.000 abstract 1
- 238000000889 atomisation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2046—Periodically cooling catalytic reactors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Jet Pumps And Other Pumps (AREA)
- Exhaust Gas After Treatment (AREA)
- Nozzles (AREA)
Abstract
The invention relates to a water-cooling air-assisted self-control urea solution injection system. The urea spraying device is characterized by comprising a gas source, a urea tank and an injector, wherein the injector comprises a shell, an internal flow passage, a lower cavity, an inner cavity pipe and a liquid inlet joint, the internal flow passage is arranged in the shell, the internal flow passage and the shell form an air cavity, a vent pipe is arranged on the shell, and the vent pipe is communicated with the air cavity; the urea tank is connected with a liquid inlet joint of the injector through a liquid conveying pipe, and the air source is connected with a vent pipe of the injector through an air conveying pipe. The invention realizes two operation modes of emptying urea solution in the liquid conveying pipeline, and ensures that no liquid remains in the liquid conveying pipeline when the operation is stopped; in addition, after the air source breather pipe enters the air cavity, the liquid passing through the electromagnetic proportional valve, the inner cavity pipe and the inner core can be cooled, and meanwhile, cooling water is sent into the cooling cavity through the cooperation of the high-position water outlet pipe and the low-position water inlet pipe, so that the liquid passing through the ejector is cooled.
Description
Technical Field
The invention relates to a water-cooling air-assisted self-control urea solution injection system.
Background
Although the gas-assisted urea metering pump plays a vital role in the SCR aftertreatment system, the existing gas-assisted urea metering pump also has the following disadvantages: the structure is complicated, manufacturing cost is too high, the structural tightness requirement is high, the pump body and the nozzle are separated so as to waste installation space, the integration is not facilitated, the installation and the maintenance are inconvenient, and the atomization effect is not obvious. Therefore, optimizing the structure, reducing the manufacturing cost, facilitating the installation and maintenance and improving the atomization effect becomes the problem to be solved urgently.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a technical scheme of a water-cooling air-assisted self-control urea solution injection system.
The water-cooling air-assisted self-control urea solution injection system is characterized by comprising an air source, a urea tank and an injector utilizing negative pressure drainage; the ejector comprises a shell, an inner runner, a lower cavity, an inner cavity pipe and a liquid inlet joint, wherein the inner runner is arranged in the shell, the inner runner and the shell form an air cavity, an air pipe is arranged on the shell and communicated with the air cavity, a runner outlet of the inner runner is flush with an air passage outlet of the air cavity, negative pressure can be formed at an injection port of the ejector, the lower cavity is connected with the shell through a fixed flange, the inner cavity pipe is arranged in the lower cavity and communicated with the inner runner, the inner cavity pipe and the lower cavity form a cooling cavity, a low-level water inlet pipe and a high-level water outlet pipe are arranged on the lower cavity and are communicated with the cooling cavity, a height difference is formed between the low-level water inlet pipe and the high-level water outlet pipe, and the liquid inlet joint is arranged above the inner cavity pipe; the urea tank is connected with a liquid inlet joint of the injector through a liquid conveying pipe, and the air source is connected with a vent pipe of the injector through an air conveying pipe.
The water-cooling air auxiliary automatic control urea solution injection system is characterized in that a branch pipe is led out of the liquid conveying pipe and is communicated with the atmosphere through a normally closed electromagnetic valve; an air constant pressure electromagnetic valve is arranged on the gas conveying pipe between the gas source and the ejector; a proportional electromagnetic valve is arranged on a liquid conveying pipe between the ejector and the urea tank.
The water-cooling air-assisted self-control urea solution injection system is characterized in that the normally-closed electromagnetic valve is a normally-closed two-position two-way electromagnetic valve, the normally-closed end of the normally-closed two-position two-way electromagnetic valve is connected with the branch pipe, and the normally-open end of the normally-closed two-position two-way electromagnetic valve is communicated with the atmosphere.
The water-cooling air-assisted self-control urea solution injection system is characterized in that a normally open electromagnetic valve is arranged on a liquid conveying pipe between the urea tank and the injector; an air constant pressure electromagnetic valve is arranged on the gas conveying pipe between the gas source and the ejector; a proportional electromagnetic valve is arranged on a liquid conveying pipe between the ejector and the normally open electromagnetic valve.
The water-cooling air-assisted self-control urea solution injection system is characterized in that the normally-open electromagnetic valve is a normally-open two-position three-way electromagnetic valve, the normally-open end of the normally-open two-position three-way electromagnetic valve is communicated with a urea tank and a liquid conveying pipe, and the normally-closed end of the normally-open two-position three-way electromagnetic valve is communicated with the atmosphere.
The water-cooling air-assisted self-control urea solution injection system is characterized in that the air constant-pressure electromagnetic valve is of a normally-closed two-position two-way structure, and the proportional electromagnetic valve is of a normally-closed structure.
The water-cooling air auxiliary type self-control urea solution injection system is characterized in that the internal flow channel consists of an inner core and a connecting pipe, the connecting pipe is arranged above the inner core, and the connecting pipe is communicated with an inner cavity pipe; the fixed flange, the shell, the inner core and the connecting pipe form an air cavity, and the vent pipe is arranged on the circumference of the fixed flange and communicated with the air cavity.
The water-cooling air-assisted self-control urea solution injection system is characterized in that the proportional electromagnetic valve is arranged in an inner cavity pipe and fixedly connected with the liquid inlet joint through a C-shaped seat arranged on the inner cavity pipe.
The control method of the water-cooled air auxiliary automatic control urea solution injection system is characterized by comprising the following steps of:
spray state: the air constant pressure electromagnetic valve is electrified and opened to ensure that the flow rate of compressed air entering the injector is constant, negative pressure is formed at the injection port of the injector, meanwhile, the normally closed electromagnetic valve is powered off and closed, the proportional electromagnetic valve is electrified to ensure that a pressure difference is formed between the urea tank and the injector, urea solution in the urea tank is pressed into the injector, the injection port of the injector is mixed with the compressed air and atomized for injection, and the injection quantity of the urea solution is controlled by adjusting the duty ratio of the proportional electromagnetic valve;
emptying state: after the injection is completed, the air constant-pressure electromagnetic valve is kept electrified, the proportional electromagnetic valve is fully opened, the normally closed electromagnetic valve is electrified and opened, the outlet of the urea tank is communicated with the atmosphere through the normally closed electromagnetic valve, so that the inlet and outlet pressures of the urea tank are the same, and urea solution in a liquid conveying pipeline connected with the normally closed electromagnetic valve and the proportional electromagnetic valve is emptied, and the emptying time is set to be 30-60 seconds; when the emptying is finished, the air constant pressure electromagnetic valve is firstly closed, the time delay is 1-2 seconds, and then the proportional electromagnetic valve and the normally closed electromagnetic valve are sequentially closed.
The control method of the water-cooled air auxiliary automatic control urea solution injection system is characterized by comprising the following steps of:
spray state: the air constant pressure electromagnetic valve is electrified and opened to ensure that the flow rate of compressed air entering the injector is constant, negative pressure is formed at the injection port of the injector, meanwhile, the normally open electromagnetic valve is powered off to keep normally open, the proportional electromagnetic valve is electrified to ensure that a pressure difference is formed between the urea tank and the injector, urea solution in the urea tank is pressed into the injector, the injection port of the injector is mixed with the compressed air and atomized for injection, and the injection quantity of the urea solution is controlled by adjusting the duty ratio of the proportional electromagnetic valve;
emptying state: after the injection is completed, the air constant pressure electromagnetic valve is kept electrified, the proportional electromagnetic valve is fully opened, the normally open electromagnetic valve is electrified, so that the outlet of the urea tank is closed, the liquid conveying pipeline connecting the normally closed electromagnetic valve and the proportional electromagnetic valve is communicated with the atmosphere through the normally open electromagnetic valve, urea solution in the liquid conveying pipeline connecting the normally open electromagnetic valve and the proportional electromagnetic valve is emptied, the emptying time is set to be 30-60 seconds, the air constant pressure electromagnetic valve is firstly closed when the emptying is completed, the time is delayed for 1-2 seconds, and then the proportional electromagnetic valve and the normally open electromagnetic valve are sequentially closed.
The invention provides an injector and an injection system with simple and reasonable structure, which do not need a specific SCR urea pump to control the injection quantity in the prior art, and only adjust the duty ratio of a proportional electromagnetic valve in the injector to adjust the injection quantity, namely have the functions of a pump and a nozzle; meanwhile, 2 different operation modes of emptying urea solution through liquid conveying pipelines are designed, so that no liquid residue exists in the liquid conveying pipelines when the operation is stopped, the pipeline environment is improved when the operation is stopped, the pipeline is prevented from being burdened, and the service life of the pipeline is prolonged; in addition, after the air source breather pipe enters the air cavity, the liquid passing through the electromagnetic proportional valve, the inner cavity pipe and the inner core can be cooled, and meanwhile, cooling water is sent into the cooling cavity through the cooperation of the high-position water outlet pipe and the low-position water inlet pipe, so that the liquid passing through the ejector is cooled.
Drawings
FIG. 1 is a schematic view of a first connection structure;
FIG. 2 is a schematic diagram of a first evacuation configuration;
FIG. 3 is a schematic view of a second connection structure;
FIG. 4 is a schematic diagram of a second evacuation configuration;
FIG. 5 is a schematic diagram of an injector;
FIG. 6 is a schematic diagram II of an injector;
FIG. 7 is a schematic diagram III of an injector;
in the figure: 1-urea tank, 2-normally closed electromagnetic valve, 3-proportional electromagnetic valve, 4-injector, 5-air constant pressure electromagnetic valve, 6-air source, 7-normally open electromagnetic valve and 8-vent pipe; 9-a housing; 10-an inner core; 11-connecting pipes; 12-an internal flow passage; 13-air cavity; 14-fixing the flange; 15-lower cavity; 16-lumen tube; 17-a cooling chamber; 18-a liquid inlet joint; a 19-C type seat; 20-a high-order water outlet pipe; 21-low level water outlet pipe.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the water-cooling air auxiliary automatic control urea solution injection system comprises an air source 6, a urea tank 1 and an injector 4 utilizing negative pressure drainage, wherein the injector comprises a shell 9, an inner runner 12, a lower cavity 15, an inner cavity pipe 16 and a liquid inlet joint 18, the inner runner is arranged in the shell 9, the inner runner 12 and the shell form an air cavity 13, a vent pipe 8 is arranged on the shell, the vent pipe 8 is communicated with the air cavity 13, the runner outlet of the inner runner 12 is flush with the air channel outlet of the air cavity, the injection port of the injector can form negative pressure, the lower cavity is connected with the shell through a fixed flange 14, the inner cavity pipe 16 is arranged in the lower cavity, the inner cavity pipe 16 is communicated with the inner runner, the inner cavity pipe 16 and the lower cavity 15 form a cooling cavity 17, a low-level water inlet pipe 21 and a high-level water outlet pipe 20 are arranged on the lower cavity, the low-level water inlet pipe and the high-level water outlet pipe are communicated with the cooling cavity 17, the low-level water inlet pipe and the high-level water outlet pipe have a height difference, the urea solution flowing through the injector is cooled by the low-level water inlet pipe, then flows out of the high-level water source cooling water source, the cooling water comes from the engine cooling water, the inner cavity pipe is provided with the liquid inlet joint 18 above the inner cavity pipe; the urea tank 1 is connected with a liquid inlet joint of the injector through a liquid conveying pipe, an air source is connected with a vent pipe of the injector through an air conveying pipe, and negative pressure is formed at an injection port of the injector.
Example 1
A branch pipe is led out of the liquid conveying pipe and is communicated with the atmosphere through a normally closed electromagnetic valve 2; an air constant pressure electromagnetic valve 5 is arranged on the gas conveying pipe between the gas source 6 and the ejector 4; a proportional electromagnetic valve 3 is arranged on the liquid conveying pipe between the injector and the urea tank. The normally closed electromagnetic valve is a normally closed two-position two-way electromagnetic valve, the normally closed end of the normally closed two-position two-way electromagnetic valve is connected with the branch pipe, and the normally open end of the normally closed two-position two-way electromagnetic valve is communicated with the atmosphere. The air constant pressure electromagnetic valve is of a normally closed two-position two-way structure, and the proportional electromagnetic valve is of a normally closed structure.
The control method of the water-cooled air-assisted self-control urea solution injection system according to the embodiment is as follows,
spray state: the air constant pressure electromagnetic valve is electrified and opened to ensure that the flow rate of compressed air entering the injector is constant, negative pressure is formed at the injection port of the injector, meanwhile, the normally closed electromagnetic valve is powered off and closed, the proportional electromagnetic valve is electrified to ensure that a pressure difference is formed between the urea tank and the injector, urea solution in the urea tank is pressed into the injector, the injection port of the injector is mixed with the compressed air and atomized for injection, and the injection quantity of the urea solution is controlled by adjusting the duty ratio of the proportional electromagnetic valve;
emptying state: after the injection is completed, the air constant-pressure electromagnetic valve is kept electrified, the proportional electromagnetic valve is fully opened, the normally closed electromagnetic valve is electrified and opened, the outlet of the urea tank is communicated with the atmosphere through the normally closed electromagnetic valve, so that the inlet and outlet pressures of the urea tank are the same, and urea solution in a liquid conveying pipeline connected with the normally closed electromagnetic valve and the proportional electromagnetic valve is emptied, and the emptying time is set to be 30-60 seconds; when the emptying is finished, the air constant pressure electromagnetic valve is firstly closed, the time delay is 1-2 seconds, and then the proportional electromagnetic valve and the normally closed electromagnetic valve are sequentially closed.
Example 2
A normally open electromagnetic valve 7 is arranged on the liquid conveying pipe between the urea tank and the ejector; an air constant pressure electromagnetic valve 5 is arranged on the gas conveying pipe between the gas source 6 and the ejector 4; a proportional solenoid valve 3 is arranged on the liquid delivery pipe between the injector and the normally open solenoid valve. The normally open electromagnetic valve is a normally open two-position three-way electromagnetic valve, the normally open end of the normally open two-position three-way electromagnetic valve is communicated with the urea tank and the liquid conveying pipe, and the normally closed end of the normally open two-position three-way electromagnetic valve is communicated with the atmosphere. The air constant pressure electromagnetic valve is of a normally closed two-position two-way structure, and the proportional electromagnetic valve is of a normally closed structure.
The control method of the water-cooled air-assisted self-control urea solution injection system according to the embodiment is as follows,
spray state: the air constant pressure electromagnetic valve is electrified and opened to ensure that the flow rate of compressed air entering the injector is constant, negative pressure is formed at the injection port of the injector, meanwhile, the normally open electromagnetic valve is powered off to keep normally open, the proportional electromagnetic valve is electrified to ensure that a pressure difference is formed between the urea tank and the injector, urea solution in the urea tank is pressed into the injector, the injection port of the injector is mixed with the compressed air and atomized for injection, and the injection quantity of the urea solution is controlled by adjusting the duty ratio of the proportional electromagnetic valve;
emptying state: after the injection is completed, the air constant pressure electromagnetic valve is kept electrified, the proportional electromagnetic valve is fully opened, the normally open electromagnetic valve is electrified, so that the outlet of the urea tank is closed, the liquid conveying pipeline connecting the normally closed electromagnetic valve and the proportional electromagnetic valve is communicated with the atmosphere through the normally open electromagnetic valve, urea solution in the liquid conveying pipeline connecting the normally open electromagnetic valve and the proportional electromagnetic valve is emptied, the emptying time is set to be 30-60 seconds, the air constant pressure electromagnetic valve is firstly closed when the emptying is completed, the time is delayed for 1-2 seconds, and then the proportional electromagnetic valve and the normally open electromagnetic valve are sequentially closed.
For the processing of being convenient for, the inside runner comprises inner core 10 and connecting pipe 11, and the connecting pipe setting is in the inner core top, and connecting pipe and inner chamber pipe intercommunication, flange, shell, inner core and connecting pipe constitute the air cavity this moment, and the breather pipe setting is on the flange circumference and with the air cavity intercommunication, and breather pipe and flange's installation angle can be adjusted, can be according to the operating mode and decide.
In order to control the jet flow of the jet, a proportional electromagnetic valve is arranged in the inner cavity pipe, the flow is regulated by regulating the PWM duty ratio of the proportional electromagnetic valve, and the proportional electromagnetic valve is fixedly connected with the liquid inlet joint through a C-shaped seat 19 arranged on the inner cavity pipe.
The inner core is provided with a connecting pipe, the fixed flange is provided with a vent pipe, the inner core and the connecting pipe are arranged on the shell together, then the inner core and the connecting pipe are arranged on the fixed flange together, and the shell, the fixed flange, the inner core and the connecting pipe form an air cavity and are communicated with the air inlet pipe; the lower cavity is arranged on the fixed flange, the proportional electromagnetic valve and the C-shaped seat are arranged on the inner cavity pipe, the liquid inlet joint is tightly pressed on the proportional electromagnetic valve, and then the liquid inlet joint is fixed on the C-shaped seat by using a screw. The liquid inlet joint, the proportional electromagnetic valve, the inner cavity pipe, the connecting pipe and the inner core form a channel of urea solution. When in use, the injector is arranged on the mounting seat of the exhaust pipe of the diesel engine.
The air source enters the air cavity from the vent pipe of the injector through the air constant pressure electromagnetic valve 5 and finally reaches the jet orifice. The action of the air constant pressure solenoid valve 5 allows the device to obtain a constant pressure of gas. On the one hand, the air source can form negative pressure on the jet orifice to absorb liquid. On the other hand, the gas of the injection port can make the atomization effect better. Finally, the air source can also act as a cooling.
In order to make the atomization effect excellent, the radial clearance between the outer shell and the inner core at the outlet end part is uniform, and the outer shell and the inner core are flush in the axial direction at the outlet end part.
The invention is based on Bernoulli equation principle, the greater the velocity of the air flow, the smaller the pressure. After the power is on, under the ventilation condition, the outlet of the ejector forms negative pressure, the urea solution is pressed out of the urea tank by atmospheric pressure, and finally sprayed out through the liquid inlet connector, the proportional solenoid valve, the connecting pipe and the inner core, and meanwhile, a better atomization effect is achieved.
In the traditional SCR urea system, urea solution is provided by being driven by a urea pump, and higher pressure is generated in the urea pump in the process, so that the requirement on the tightness of a pipeline is high, and the failure rate of a sealing element is also high. The invention generates negative pressure in the pipeline to form pressure difference, so the requirement on the pipeline tightness is low.
The structure of the invention is equivalent to integrating the urea pump and the nozzle, has the functions of both the pump and the nozzle, and effectively integrates the urea pump and the nozzle. Therefore, the structure is optimized, and the manufacturing cost, the assembly cost and the maintenance cost can be effectively reduced.
Claims (8)
1. The water-cooled air auxiliary automatic control urea solution injection system is characterized by comprising an air source, a urea tank and an injector utilizing negative pressure drainage; the ejector comprises a shell, an inner runner, a lower cavity, an inner cavity pipe and a liquid inlet joint, wherein the inner runner is arranged in the shell, the inner runner and the shell form an air cavity, an air pipe is arranged on the shell and communicated with the air cavity, a runner outlet of the inner runner is flush with an air passage outlet of the air cavity, negative pressure can be formed at an injection port of the ejector, the lower cavity is connected with the shell through a fixed flange, the inner cavity pipe is arranged in the lower cavity and communicated with the inner runner, the inner cavity pipe and the lower cavity form a cooling cavity, a low-level water inlet pipe and a high-level water outlet pipe are arranged on the lower cavity and are communicated with the cooling cavity, a height difference is formed between the low-level water inlet pipe and the high-level water outlet pipe, and the liquid inlet joint is arranged above the inner cavity pipe; the urea tank is connected with a liquid inlet joint of the injector through a liquid conveying pipe, and the air source is connected with a vent pipe of the injector through an air conveying pipe;
a branch pipe is led out of the liquid conveying pipe and is communicated with the atmosphere through a normally closed electromagnetic valve; an air constant pressure electromagnetic valve is arranged on the gas conveying pipe between the gas source and the ejector; a proportional electromagnetic valve is arranged on a liquid conveying pipe between the ejector and the urea tank;
a normally open electromagnetic valve is arranged on a liquid conveying pipe between the urea tank and the ejector; an air constant pressure electromagnetic valve is arranged on the gas conveying pipe between the gas source and the ejector; a proportional electromagnetic valve is arranged on a liquid conveying pipe between the ejector and the normally open electromagnetic valve.
2. The water-cooled air-assisted self-control urea solution injection system according to claim 1, wherein the normally-closed electromagnetic valve is a normally-closed two-position two-way electromagnetic valve, a normally-closed end of the normally-closed two-position two-way electromagnetic valve is connected with the branch pipe, and a normally-open end of the normally-closed two-position two-way electromagnetic valve is communicated with the atmosphere.
3. The water-cooled air-assisted self-control urea solution injection system according to claim 1, wherein the normally-open electromagnetic valve is a normally-open two-position three-way electromagnetic valve, a normally-open end of the normally-open two-position three-way electromagnetic valve is communicated with a urea tank and a liquid delivery pipe, and a normally-closed end of the normally-open two-position three-way electromagnetic valve is communicated with the atmosphere.
4. The water-cooled air-assisted self-control urea solution injection system of claim 1, wherein said air constant pressure solenoid valve is of a normally closed two-position two-way configuration, and said proportional solenoid valve is of a normally closed configuration.
5. The water-cooled air-assisted self-control urea solution injection system according to claim 1, wherein the internal flow channel is composed of an inner core and a connecting pipe, the connecting pipe is arranged above the inner core, and the connecting pipe is communicated with the inner cavity pipe; the fixed flange, the shell, the inner core and the connecting pipe form an air cavity, and the vent pipe is arranged on the circumference of the fixed flange and communicated with the air cavity.
6. The water-cooled air-assisted self-control urea solution injection system according to claim 1, wherein the proportional solenoid valve is arranged in the inner cavity pipe, and the proportional solenoid valve is fixedly connected with the liquid inlet joint through a C-shaped seat arranged on the inner cavity pipe.
7. A method of controlling a water-cooled air-assisted self-controlled urea solution injection system as claimed in claim 2, comprising:
spray state: the air constant pressure electromagnetic valve is electrified and opened to ensure that the flow rate of compressed air entering the injector is constant, negative pressure is formed at the injection port of the injector, meanwhile, the normally closed electromagnetic valve is powered off and closed, the proportional electromagnetic valve is electrified to ensure that a pressure difference is formed between the urea tank and the injector, urea solution in the urea tank is pressed into the injector, the injection port of the injector is mixed with the compressed air and atomized for injection, and the injection quantity of the urea solution is controlled by adjusting the duty ratio of the proportional electromagnetic valve;
emptying state: after the injection is completed, the air constant-pressure electromagnetic valve is kept electrified, the proportional electromagnetic valve is fully opened, the normally closed electromagnetic valve is electrified and opened, the outlet of the urea tank is communicated with the atmosphere through the normally closed electromagnetic valve, so that the inlet and outlet pressures of the urea tank are the same, and urea solution in a liquid conveying pipeline connected with the normally closed electromagnetic valve and the proportional electromagnetic valve is emptied, and the emptying time is set to be 30-60 seconds; when the emptying is finished, the air constant pressure electromagnetic valve is firstly closed, the time delay is 1-2 seconds, and then the proportional electromagnetic valve and the normally closed electromagnetic valve are sequentially closed.
8. A method of controlling a water-cooled air-assisted self-controlled urea solution injection system as claimed in claim 3, comprising:
spray state: the air constant pressure electromagnetic valve is electrified and opened to ensure that the flow rate of compressed air entering the injector is constant, negative pressure is formed at the injection port of the injector, meanwhile, the normally open electromagnetic valve is powered off to keep normally open, the proportional electromagnetic valve is electrified to ensure that a pressure difference is formed between the urea tank and the injector, urea solution in the urea tank is pressed into the injector, the injection port of the injector is mixed with the compressed air and atomized for injection, and the injection quantity of the urea solution is controlled by adjusting the duty ratio of the proportional electromagnetic valve;
emptying state: after the injection is completed, the air constant pressure electromagnetic valve is kept electrified, the proportional electromagnetic valve is fully opened, the normally open electromagnetic valve is electrified, so that the outlet of the urea tank is closed, the liquid conveying pipeline connecting the normally closed electromagnetic valve and the proportional electromagnetic valve is communicated with the atmosphere through the normally open electromagnetic valve, urea solution in the liquid conveying pipeline connecting the normally open electromagnetic valve and the proportional electromagnetic valve is emptied, the emptying time is set to be 30-60 seconds, the air constant pressure electromagnetic valve is firstly closed when the emptying is completed, the time is delayed for 1-2 seconds, and then the proportional electromagnetic valve and the normally open electromagnetic valve are sequentially closed.
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